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**Molecular formula:** NaOH **Molar mass:** 39.997 g/mol **Description:** Sodium hydroxide, commonly known as lye or caustic soda, is a highly alkaline, water-soluble, white crystalline compound. It is an ionic substance composed of sodium cations (Na⁺) and hydroxide anions (OH⁻). **Applications:** Sodium hydroxide is widely used in the chemical industry as a strong base and as a precursor in the production of various sodium compounds. It is also a key ingredient in soap manufacturing. In household applications, it is commonly used as a drain and pipe cleaner.
